The anaerobic (absence of oxygen) decomposition of organic matter contained in household waste is making a major contribution to global warming due to the emission of large quantities of methane, which is a powerful greenhouse effect gas.

Plastic waste materials represent approximately 50% of what remains after sorting the compostable waste. Plastic bags in particular play a very major role in pollution. Solutions for transforming these into construction materials are offered.

Waste management is a major challenge in major cities in developing countries, as local authorities have to cope with increasing quantities of waste with limited financial resources. Composting allows to re-use a major portion of the waste and a reduction of quantities sent to landfill.